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Crustal accretion in the Manila trench accretionary wedge at the transition from subduction to mountain-building in Taiwan

Lester, Ryan ; Mcintosh, Kirk ; Van Avendonk, Harm J. A. ; Lavier, Luc ; Liu, C. - S. ; Wang, T. K.

Earth and Planetary Science Letters, August 1, 2013, Vol.375, p.430(11) [Tạp chí có phản biện]

ISSN: 0012-821X

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  • Nhan đề:
    Crustal accretion in the Manila trench accretionary wedge at the transition from subduction to mountain-building in Taiwan
  • Tác giả: Lester, Ryan ; Mcintosh, Kirk ; Van Avendonk, Harm J. A. ; Lavier, Luc ; Liu, C. - S. ; Wang, T. K.
  • Chủ đề: Crust (Geology) -- Analysis ; Geophysics -- Analysis ; Continental Margins -- Analysis ; Seismic Waves -- Analysis ; Seismic Reflection Surveying -- Analysis
  • Là 1 phần của: Earth and Planetary Science Letters, August 1, 2013, Vol.375, p.430(11)
  • Mô tả: To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.epsl.2013.06.007 Byline: Ryan Lester, Kirk McIntosh, Harm J.A. Van Avendonk, Luc Lavier, C.-S. Liu, T.K. Wang Abstract: New marine seismic reflection and coincident wide-angle ocean-bottom seismometer data acquired offshore Taiwan provide high-resolution constraints on the crustal structure of an incipient mountain belt during the earliest stage of arc-continent collision. The new seismic reflection image and travel-time tomography velocity model show evidence for crust of the distal southern Chinese continental margin being subducted eastward beneath the Manila trench and underplated to the accretionary wedge before collision with the southern Chinese continental shelf. The distal margin crust consists of highly extended continental crust interspersed with volcanic bodies and a high-velocity lower crustal layer of likely magmatic intrusions. The distal margin crust is 10-14km thick outboard of the trench, but thins to 6km thick beneath the lower slope of the Manila trench accretionary wedge. Along the lower slope of the accretionary prism, we image westward-verging imbricate thrusts and folded strata up to 10km thick. A sharp decrease in bathymetry marks the transition from lower to upper slope, where we observe a fast (>6.0km/s) seismic velocity anomaly at the base of the wedge that we interpret as structurally underplated crust from the distal continental margin. Our results support a model of arc-continent collision in Taiwan where the accretionary wedge is first thickened by structural underplating of distal margin crust prior to collision with the continental shelf. The crustal rocks exposed throughout the Central Range in Taiwan may be similarly derived from subducted and structurally underplated crust from the highly extended distal continental margin. Author Affiliation: (a) University of Texas, Institute for Geophysics, J.J. Pickle Research Campus Building 196, Austin, TX 78758-4445, USA (b) National Taiwan University, Institute of Oceanography, No. 1, Section 4, Roosevelt Road, Taipei 106, Taiwan (c) National Taiwan Ocean University, Institute of Applied Geosciences, 2 Peining Road, Keelung 20224, Taiwan Article History: Received 21 January 2013; Revised 4 June 2013; Accepted 5 June 2013 Article Note: (miscellaneous) Editor: P. Shearer
  • Ngôn ngữ: English
  • Số nhận dạng: ISSN: 0012-821X

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